Sewing-machine bobbin case



L. E. WEAVER.

SEWING MACHINE BOBBIN CASE. APPLICATION FILED ;uLY15,192|.

1A1 99 Patented June 13, 1922 LUCIUS E. WEAVER, 0.1 EAST HAMPTON, CONNECTICUT, ASSIGNQR TO SUMMIT THREAD COMPANY, OF EAST HAMPTON, COIRTNEOTICUT, A CORPORATION 033 MAINE.

SEWING-MAGHINE BOBBIN CASE.

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Application filed July 15,

T 0 oil cola-0m it WIQCZ/ concern i Be it known that l, Lucius lVnAvnn, a citizen of the United States, residing at East Hampton, in the county of lViiddlesex and State of Connecticut, have invented new and useful Improvements in Sewinghulachine Bobbin Cases, of which the following is a specification.

This invention relates to a bobbin case, including a body having a central post about which the tubular core of a universally wound bobbin is rotatable, and a bobbinsupporting plate having a core-engaging hub which is rotatable with the bobbin about the central post.

The object of the invention is to provide in a bobbin case of this character, improved means for separably connecting the said plate and its hub with the case body, and for preventing undesirably loose and free rotation of the bobbin-supporting plate and its hub.

The invention is embodied in the improvements hereinafter described and claimed.

Of the accompanying drawings forming a part of this specificat-ion,-

Figure 1 is a top plan view of, a bobbin case embodying the invention, the bobbin being removed.

F lgure 2 1s a view s1milar to Figure 1, showing the bobbin in place.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4c is a sectional view of the bobbin.

Figure 5 is a section on line 5-5 of Figure 2, certain parts being broken in elevation.

Figure 6 is a sectional view of the bobbinsupporting plate and its hub.

Figure 7 is a sectional view of the case body.

Figure 8 shows in perspective the stud and the tapered screw hereinafter described, separated from each other.

The same reference characters indicate the same parts in all of the figures.

In the drawings, 12 represents the annular wall or body of a bobbin case and 13 represents a bottom member, which is preferably a cross-bar extending across the base of the body. In the central portion of the bottom member is formed a socket 14. To the bottom member is fixed an upstanding tubular post 15, the bore of the post being concentric with, and preferably of greater Specification of Letters Patent. Patmgtgd Jung 13 1922,

1921. Serial No. 484,919.

diameter than the socket 1 1. 16 represents an annular collar seated on the bottom member 13, and embracing the base portion of the post 15. 17 represents an annular bobbin-supporting plate, adapted to rotate in the bobbin case, and provided with a tubular hub 18,1'ixed to said plate, and formed externally to engage the core 19 of a universally wound bobbin, the winding of which is shown at 20, the hub preferably having a polygonal external surface adapted to indent the core 19. The bore of the hub 18 is formed to receive and turn on the collar 16, and is provided with an annular internal lip 21, which is spaced from the collar 16, said lip and collar forming opposed spring abutments.

represents the head, and 23 the shank of a stud, the head being formed to enter the outer portion of the bore of the hub 18, and of the lip 21. The shank bear on one side 23 is tubular, and is longitudinally split at 25. The shank is formed to enter the hollow,

post 15, and its bore is slightly tapered and provided with an internal screw thread, indicated at 26 (Figure 8). 27 represents a tapered screw formed to enter the bottom member socket 141, and to expand the split shank 23 to cause a frictional engagement between the periphery of the shank and the bore of the hollow post 15.

29 represents a spring interposed between the abutments formed by the collar 16 and the lip 21. Said spring acts to press the lip 21 against the stud head 22, and thereby frictionally oppose rotation of the plate 17 and hub 18, and the bobbin engaged there with.

In assembling the parts, the collar 16 is applied to the bottom member 13 and post 15, as shown by Figure 7. The plate 17 and its hub 18 are then inserted in the body 12, the spring 29 having been previously inserted in the bore of the hub. The insertion of the plate and hub into the body causes the compression of the spring between the lip 21 and the collar 16. The stud is then inserted, its head entering the outer portion of the hub 18, and bearing on the lip 21, and its shank entering the post 15. Finally the screw 27 is inserted and expands the split shank 23 against the bore of the post 15, the shank being thus firmly engaged with the post. When the parts are assembled, the spring 29 is compressed and presses the hub lip 21 against the stud head 22, so that loose rouniversally Wound bobbin, the bore of said hub being formed to receive and turn on said collar, and provided with an annular internal lip spaced from the collar, said lip and col,-

lar forming opposed spring abutments; a studhaving a head formed to enter the hub bore and bear on one side of said lip, and a split tubular shank formed to enter the hollow post, the bore of said shank being tapered and screw-threaded; a tapered screw formed to enter the bottom member socket and expand the shank, to cause a frictional engagement between the latter and the bore of the hollow post; and a spring interposed between the abutments formed by the said collar and lip and acting to press the said lip against the stud head, and thereby frictionally oppose rotation of the bobbin-supporting plate and its hub.

In testimony whereof I have affixed my signature.

LUCIUS E. WEAVER. 

